Sensing Performance of Reduced Graphene Oxide with Various Degrees of Reduction
Biaunik Niski Kumila (1), Chuan Pu Liu (2)

(1) Department of Physics Faculty of Science and Technology, UIN Syarif Hidayatullah, Jakarta, Indonesia
(2) Departement of Materials Science and Engineering, Faculty of Engineering, National Cheng Kung University, Tainan, Taiwan

Abstract

The electrical properties of reduced graphene oxide (rGO) have been practically shown to be very sensitive to surface adsorbates, thus making rGO very promising material to gas sensing application. However, a few study of rGO sensing sites leave a problem in advanced understanding the sensing mechanism method of rGO to any adsorbate. This work aims to study the effect of rGO reduction degree in the sensing sites growth as the affecting factor of methanol sensing performance. Oxygen containing functional groups was partially removed after thermal reduction along with the restoration of sp2-carbon bond rendering the recovery of its conductivity. However the structural defects were introduced after severe thermal reduction at 8500C. The suffucient amount of sp2 fraction and perfect combination of sensing sites, i.e - sp2 fraction, oxygen functional group and structural defects is shown to be important factor to achieve the highly sensitive sensor device with fast response and recovery time due to its unique response to various adorbates. In our work, higher device sensitivity towards methanol detection was discovered in comparison to previous work discovered by Lipatov et al 1 and we further proposed its possible sensing mechanism.

Keywords: reduced graphene oxide- reduction degree- sp2 fraction- oxygen functional group- structural defect

Topic: Nanomaterial and Nanotechnology